use boost for lround, as it is not available on MSVC2012
use boost for lround, as it is not available on MSVC2012

boundlessgeo/PDAL,mtCarto/PDAL,DougFirErickson/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,lucadelu/PDAL,jwomeara/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,Sciumo/PDAL,radiantbluetechnologies/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,boundlessgeo/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,DougFirErickson/PDAL,mpgerlek/PDAL-old,boundlessgeo/PDAL,jwomeara/PDAL,Sciumo/PDAL,DougFirErickson/PDAL,Sciumo/PDAL,jwomeara/PDAL,lucadelu/PDAL,DougFirErickson/PDAL